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NaA 제올라이트 분리막의 알코올 투과증발 특성과 미세구조에서 수열 겔 코팅의 효과
Effect of Hydrothermal Gel Coating on Morphology and Alcohol Dehydration Characteristics of NaA Zeolite Membrane
In the present work, a new synthesis method has been reported for preparing high-quality NaA zeolite membrane. The present method involves pressure-driven hydrothermal gel coating method(HGCM) on seeded α-alumina support surface having pores of 0.1 and 0.7μm diameter before the secondary growth process. The experimental data revealed that the high-pressure injection of hydrothermal gel solution on α-alumina support surface helped in the pore filling and thin layer coating of gel particles, which promoted the formation of uniform, defect free, and dense zeolite layer. Pervaporative dehydration experiments were conducted for 50 wt.% ethanol-water mixture at 343K. The NaA zeolite membrane, which was prepared by HGCM process on the 0.7μm support, showed that the high total flux was 4.7 kg m-2h-1 and separation factor was more than >1000.
